响应WM_NCPAINT画边框，求示例！

大狗狗 2010-12-15 07:40:18

环境：VS2005 C# WinForm

重载WndProc处理WM_NCPAINT，网上有示例，但都只是画了个标题栏。我想连边框也画，但不幸的是，窗口加载后，边框大部分竟然未能画出来(只有一部分着上了色，其余皆黑)。但用鼠标变化下窗口位置后，边框就正常地显示出来了。

下面代码是重画标题栏的，求哪位大虾给改进一下，使它能连边框也画出来。随便色彩形状，只要是能在窗口加载后按代码里的显示出来就行。



using System.Runtime.InteropServices;

using System.Drawing.Drawing2D;



[DllImport("user32.dll")]

private static extern IntPtr GetWindowDC(IntPtr hWnd);

[DllImport("user32.dll")]

private static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);



private const int WM_NCPAINT = 0x0085;

private const int WM_NCACTIVATE = 0x0086;

private const int WM_NCLBUTTONDOWN = 0x00A1;

protected override void WndProc(ref Message m)

{

    base.WndProc(ref m);

    Rectangle vRectangle = new Rectangle((Width - 75) / 2, 3, 75, 25);

    switch (m.Msg)

    {

        case WM_NCPAINT:

        case WM_NCACTIVATE:

            IntPtr vHandle = GetWindowDC(m.HWnd);

            Graphics vGraphics = Graphics.FromHdc(vHandle);

            vGraphics.FillRectangle(new LinearGradientBrush(vRectangle, 

                Color.Pink, Color.Purple, LinearGradientMode.BackwardDiagonal),

                vRectangle);

            

            StringFormat vStringFormat = new StringFormat();

            vStringFormat.Alignment = StringAlignment.Center;

            vStringFormat.LineAlignment = StringAlignment.Center;

            vGraphics.DrawString("About", Font, Brushes.BlanchedAlmond, 

                vRectangle, vStringFormat);



            vGraphics.Dispose();

            ReleaseDC(m.HWnd, vHandle);

            break;

        case WM_NCLBUTTONDOWN:

            Point vPoint = new Point((int)m.LParam);

            vPoint.Offset(-Left, -Top);

            if (vRectangle.Contains(vPoint))

                MessageBox.Show(vPoint.ToString());

            break;

    }

}